[Resolved]  Sony Ericsson - W910i — Not working properly.

I have purchased Sony Ericsson model no. W910i, serail no.[protected] on 29/08/08 is facing following problems:
1. mobile hangs very frequently.
2.when we dial a new no. it doesnt show the dialling display, it shows the number only even if the number gets connected.
3. Once connected it doesnt disconnect.
4.While receiving calls, busy tone apppears automatically to the caller.
5.Charger is not working properly.
I have complained against this on 22/10/08 at Salora International limited, Indore -452001 also.My complaint ID was SES08IND16122.But there was no change in the problems.Since the product is under gurantee period and facing the above problems seriously .I just want the fresh piece .I am not going to go for repairing because tried so many times to be get repaired.